U.S. Pipeline Contractors Association and Unions Pledge Their Support for Keystone XL Project

Project will create thousands of jobs in the U.S.

CALGARY, ALBERTA--(Marketwire - Sept. 14, 2010) - TransCanada Corporation (TransCanada) (TSX:TRP) (NYSE:TRP) today is pleased to announce a Project Labor Agreement for a significant portion of U.S. construction of the proposed US$7 billion Keystone Gulf Coast Expansion Pipeline Project (Keystone XL). The agreement will provide TransCanada with a capable, well-trained and ready workforce in the U.S. to construct Keystone XL. During construction, the project is expected to create over seven million hours of labor and over 13,000 new jobs for American workers.

The Project Labor Agreement is with the Laborers International Union of North America, the International Brotherhood of Teamsters, the United Association of Journeymen and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada, AFL-CIO, the International Union of Operating Engineers and the Pipeline Contractors Association.

"The proposed Keystone XL pipeline will have a significant impact on the North American economy through the thousands of manufacturing and construction jobs it is creating," says Russ Girling, TransCanada president and chief executive officer. "This project is entirely paid for with private sector dollars and is shovel ready."

"It's our job to weld sections of Keystone Pipeline that will extend miles underground, across several states and transport hundreds of thousands of barrels of oil daily for decades to come," said William Hite, General President of the United Association of Journeymen and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada, AFL-CIO. "It's the vision and competence of TransCanada in the U.S. that provides our skilled local workforce with the means to perform the trade they have been taught while contributing to their communities. We are proud to be a part of the collaboration that is Keystone Pipeline."

"An ambitious project of this scope, spanning over five states and employing thousands of American construction workers, will unequivocally help remedy the struggles of our country's working families," said International Union of Operating Engineers General President Vincent J. Giblin. "History has proven time and time again that infrastructure projects, such as this, lead to the resurgence of our nation's economy and the ripple effects are far-reaching. The IUOE is proud to be part of the Keystone XL pipeline and our operating engineers throughout the Midwest are ready to provide TransCanada with the skill, professionalism and pride this project requires."

"This illustrates how PLAs are a win-win for employers, for working men and women and for our communities and our countries," said Terry O'Sullivan, General President of LIUNA. "The partnership between TransCanada and workers and their unions will create good family-supporting jobs, while helping business and our countries compete."

"The Keystone Pipeline project will offer working men and women a real chance to earn a good wage and support their families in this difficult economic climate," said International Brotherhood of Teamsters James P. Hoffa. "Our country was built by the hard-working men and women of the middle class - when they prosper so does America. Investment projects like Keystone Pipeline will go a long way toward helping our country down the road to economic recovery."

An independent study estimates that during the life of the project, the Keystone XL project is expected to stimulate:

-- More than $20 billion in new spending for the U.S. economy
-- More than 118,000 person-years of employment
-- An increase of $6.5 billion in the personal income of Americans
-- Increased gross output (product) of $9.6 billion
-- More than $585 million in state and local taxes in the states along the
pipeline route

"This project will also play an important role in linking a secure and growing supply of Canadian crude oil with the largest refining markets in the United States, significantly improving North American energy security," added Girling.

Project Labor Agreements were first used on the big public works projects of the 1930s including the Grand Coulee Dam, Hoover Dam, and Shasta Dam. Since then, scores of large projects, public and private, have been built across the nation using Project Labor Agreements.

TransCanada received approval in March 2010 from the National Energy Board in Canada for the proposed Keystone expansion project. When completed, the expansion project will increase the commercial capacity of the Keystone Pipeline System from 590,000 barrels per day to approximately 1.1 million barrels per day. The US$12 billion system is 83 percent subscribed with long-term, binding contracts that include commitments of 910,000 barrels per day for an average term of approximately 18 years.

Construction and operation of the Keystone Pipeline System will continue to meet or exceed world-class safety and environmental standards. Through this agreement, the project will be built with highly trained and capable resources in states like Montana, South Dakota, Nebraska, Kansas, Oklahoma and Texas who will ensure that the project is implemented with a clear focus on safety, quality and environmental considerations.

The Keystone expansion project is a planned 1,959-mile (3,134-kilometre), 36-inch crude oil pipeline stretching from Hardisty, Alberta and moving southeast through Saskatchewan, Montana, South Dakota and Nebraska. It will link up with a portion of the Keystone Pipeline that will be built through Kansas to Cushing, Oklahoma and facilitate take away capacity from U.S. hubs located on the pipeline. The pipeline will then continue on through Oklahoma to a delivery point near existing terminals in Nederland, Texas to serve the Port Arthur, Texas marketplace.

To view a map of the proposed pipeline route, please visit the project web page at www.transcanada.com/keystone

The Laborers International Union of North America represents half a million workers in the heavy construction and building construction trade, the International Brotherhood of Teamsters represents 1.4 million professionals in the private and public sector, the United Association of Journeymen and Apprentices of the Plumbing and Pipefitting Industry of the United States and Canada, AFL-CIO represents 300,000 members across North America in the plumbing and pipefitting industry, and the International Union of Operating Engineers represents 400,000 operating engineers, who work as heavy equipment operators, mechanics, and surveyors in the construction industry, and stationary engineers, who work in operations and maintenance in building and industrial complexes, and in the service industries.

With more than 50 years' experience, TransCanada is a leader in the responsible development and reliable operation of North American energy infrastructure including natural gas and oil pipelines, power generation and gas storage facilities. TransCanada's network of wholly owned natural gas pipelines extends more than 60,000 kilometres (37,000 miles), tapping into virtually all major gas supply basins in North America. TransCanada is one of the continent's largest providers of gas storage and related services with approximately 380 billion cubic feet of storage capacity. A growing independent power producer, TransCanada owns, or has interests in, over 11,700 megawatts of power generation in Canada and the United States. TransCanada is developing one of North America's largest oil delivery systems. TransCanada's common shares trade on the Toronto and New York stock exchanges under the symbol TRP. For more information visit: www.transcanada.com

TransCanada Forward-Looking Information

This news release may contain certain information that is forward looking and is subject to important risks and uncertainties. The words "anticipate", "expect", "believe", "may", "should", "estimate", "project", "outlook", "forecast" or other similar words are used to identify such forward-looking information. Forward-looking statements in this document are intended to provide TransCanada securityholders and potential investors with information regarding TransCanada and its subsidiaries, including management's assessment of TransCanada's and its subsidiaries' future financial and operations plans and outlook. Forward-looking statements in this document may include, among others, statements regarding the anticipated business prospects and financial performance of TransCanada and its subsidiaries, expectations or projections about the future, and strategies and goals for growth and expansion. All forward-looking statements reflect TransCanada's beliefs and assumptions based on information available at the time the statements were made. Actual results or events may differ from those predicted in these forward-looking statements. Factors that could cause actual results or events to differ materially from current expectations include, among others, the ability of TransCanada to successfully implement its strategic initiatives and whether such strategic initiatives will yield the expected benefits, the operating performance of TransCanada's pipeline and energy assets, the availability and price of energy commodities, capacity payments, regulatory processes and decisions, changes in environmental and other laws and regulations, competitive factors in the pipeline and energy sectors, construction and completion of capital projects, labour, equipment and material costs, access to capital markets, interest and currency exchange rates, technological developments and the current economic conditions in North America. By its nature, forward-looking information is subject to various risks and uncertainties, which could cause TransCanada's actual results and experience to differ materially from the anticipated results or expectations expressed. Additional information on these and other factors is available in the reports filed by TransCanada with Canadian securities regulators and with the U.S. Securities and Exchange Commission (SEC). Readers are cautioned to not place undue reliance on this forward-looking information, which is given as of the date it is expressed in this news release or otherwise, and to not use future-oriented information or financial outlooks for anything other than their intended purpose. TransCanada undertakes no obligation to update publicly or revise any forward-looking information, whether as a result of new information, future events or otherwise, except as required by law.